BMI Calculation (Body Mass Index)
BMI is the ratio between your weight and your height squared. It's the most used indicator in the world to evaluate body size. Simple, fast, but to be interpreted with perspective.
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Create my planHow is BMI calculated?
The formula is simple: BMI = weight (kg) ÷ height² (m²).
Example: 75 kg at 1.78 m → 75 ÷ (1.78 × 1.78) = 75 ÷ 3.17 = 23.7.
The World Health Organization classifies results into 4 categories: underweight (< 18.5), normal weight (18.5 – 25), overweight (25 – 30), obesity (> 30).
The limits of BMI
BMI doesn't distinguish between muscle and fat. A 100 kg rugby player who is 1.80 m tall will have a BMI of 30.9 ("obese") even though they are in great shape.
BMI doesn't take fat distribution into account. However, abdominal (visceral) fat is much more dangerous than subcutaneous fat. A waist circumference > 94 cm (men) or > 80 cm (women) is a better indicator of cardiovascular risk.
Quand consulter ?
A BMI outside the 18.5 – 25 zone doesn't necessarily mean there's a problem. But if you are over- or underweight AND feel fatigue, shortness of breath, or joint pain, it's time to see a doctor or dietitian.
BMI is a starting point, not a verdict. Combine it with other indicators (waist circumference, fat mass, physical performance) for a complete view.